Split bcd(6), morse(6), and ppt(6) into three separate manuals

since most of the text is different.
Improve the SYNOPSIS according to suggestions by jmc@, tweaked by me.
Delete a few redundant words, applying a patch from jmc@.
Intentionally not doing any other text changes in this commit;
for further tweaking in the tree.

jmc@, tedu@, and millert@ agree with the general direction, and
deraadt@ suspects we are "all grey beard fanatics" (in all caps).

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